diff --git a/src/parser/sexp.rs b/src/parser/sexp.rs
index 3694554..9c98ef7 100644
--- a/src/parser/sexp.rs
+++ b/src/parser/sexp.rs
@@ -44,28 +44,28 @@ impl<'s> Token<'s> {
     pub fn as_vector<'p>(&'p self) -> Result<&'p Vec<Token<'s>>, Box<dyn std::error::Error>> {
         Ok(match self {
             Token::Vector(children) => Ok(children),
-            _ => Err(format!("wrong token type {:?}", self)),
+            _ => Err(format!("wrong token type, expected vector: {:?}", self)),
         }?)
     }
 
     pub fn as_list<'p>(&'p self) -> Result<&'p Vec<Token<'s>>, Box<dyn std::error::Error>> {
         Ok(match self {
             Token::List(children) => Ok(children),
-            _ => Err(format!("wrong token type {:?}", self)),
+            _ => Err(format!("wrong token type, expected list: {:?}", self)),
         }?)
     }
 
     pub fn as_atom<'p>(&'p self) -> Result<&'s str, Box<dyn std::error::Error>> {
         Ok(match self {
             Token::Atom(body) => Ok(*body),
-            _ => Err(format!("wrong token type {:?}", self)),
+            _ => Err(format!("wrong token type, expected atom: {:?}", self)),
         }?)
     }
 
     pub fn as_text<'p>(&'p self) -> Result<&'p TextWithProperties<'s>, Box<dyn std::error::Error>> {
         Ok(match self {
             Token::TextWithProperties(body) => Ok(body),
-            _ => Err(format!("wrong token type {:?}", self)),
+            _ => Err(format!("wrong token type, expected text: {:?}", self)),
         }?)
     }